Integration of geophysical methods in studying the area of groundwater pollution by oil products in Verkh-Neyvinsky Village

The purpose of the work. The problem of providing the population with drinking water in the technogenically loaded Ural region is becoming increasingly urgent, including due to emergency situations. An obvious example of technogenic loss of natural resources of drinking groundwater in the Sverdlovsk region is the eastern part of the urban-type settlement of Verkh-Neyvinsky, where private residential buildings are not provided with centralized water supply sources. The situation arose as a result of an emergency leak of oil products at one of the underground elements of a local gas station. Since 2017, the underground water has become unsuitable for drinking, as well as for use in agriculture. Today, the water contains an excess of oil products, which is also manifested in organoleptic indicators. The work was carried out to study the distribution of technogenic hydrocarbons in the underground space of the specified territory with a detailed description of their distribution area to substantiate technical solutions for localizing pollution and extracting oil products. Methods. To select the optimal location for hydrogeological wells in the areas of suspected contamination, ground geophysical studies were conducted using the vertical electrical sounding (VES) method. Visual inspections of the boreholes of drilled wells were performed to assess their technical condition and study the borehole walls for the presence of residual oil products, and an atmogeochemical survey was also conducted to identify areas with the strongest manifestation of gasoline vapor gas content in underground spaces. Results. A comprehensive interpretation of the results of electrical exploration, atmogeochemical survey, hydrogeological testing and video logging made it possible to identify zones of suspected underground flow of oil products. Maps of apparent electrical resistance and geological and electrical sections along the profiles were constructed. Conclusions. Based on the results of geophysical and atmogeochemical studies, a zone of maximum concentration of oil products in water and soil air was noted, a zone of decompression was identified, along which active underground flow into a drinking surface water body probably occurs, the roof of granodiorites was broken off, separating different conditions of migration of technogenic hydrocarbons. The specified points of laying hydrogeological wells made it possible to create an effective observation network and visually confirm the places of maximum concentration of oil products in underground horizons using video logging.